210 



GEOGRAPHICAL ZOOLOGY. 



[PART IV. 



extinct whales and dolphins having been described, most of them 

 belonging to extinct genera. 



The Zeuglodontidse, an extinct family of carnivorous whales, 

 with double-fanged serrated molar teeth, whose affinities are 

 somewhat doubtful, are found in the older Pliocene of Europe, 

 and in the Miocene and Eocene ot the Eastern United States. 

 Zcuglodon abounds in the United States, and one species reached 

 a length of seventy feet. A species of this genus is said to have 

 been found in Malta. Squalodon occurs in Europe and North 

 America ; and in the latter country four or five other genera have 

 been described, of which one, Saurocetes, has been found also at 

 Buenos Ayres. 



Order VI.—SIRENIA. 

 Family 42.— MANATID^E. (3 Genera, 5 Species ?) 



General Distribution. 



The Sea-cows are herbivorous aquatic animals living on the 

 coasts or in the great rivers of several parts of the globe. Ma- 

 natus (2 species) inhabits both shores of the Atlantic, one 

 species ranging from the Gulf of Mexico to North Brazil, and 

 ascending the Amazon far into the interior of the continent ; 

 while the other is found on the west coast of Africa. Halicore (2 

 species ?), the Dugong, is peculiar to the Indian Ocean, extending 

 from Mozambique to the Red Sea, thence to Western India and 

 Ceylon, the Malay Archipelago and the north coast of Australia. 

 Rytina (1 species), supposed to be now extinct, inhabited re- 

 cently the North Pacific, between Kamschatka and Behring's 

 Straits. 



Fossil Sir&nda. — Extinct species of Manatus have been found 

 in the Post-pliocene deposits of Eastern North America from 



